package com.ruoyi.common.utils.hangxin;

import java.security.*;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
 * 字符串工具集合
 * 
 * @author liyun
 */
public class HexUtil {

	//private static final String PASSWORD_CRYPT_KEY = "2132322323";
	//private static final String PASSWORD_CRYPT_KEY = "c_jDlog_";
	private final static String DES = "DES";

	
	/**
	 * 解密
	 * 
	 * @param src 数据源
	 * @param key 密钥，长度必须是8的倍数
	 * @return 返回解密后的原始数据
	 * @throws Exception
	 */
	public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
		// DES算法要求有一个可信任的随机数源
		SecureRandom sr = new SecureRandom();
		// 从原始密匙数据创建一个DESKeySpec对象
		DESKeySpec dks = new DESKeySpec(key);
		// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
		// 一个SecretKey对象
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
		SecretKey securekey = keyFactory.generateSecret(dks);
		// Cipher对象实际完成解密操作
		Cipher cipher = Cipher.getInstance(DES);
		// 用密匙初始化Cipher对象
		cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
		// 现在，获取数据并解密
		// 正式执行解密操作
		return cipher.doFinal(src);
	}

	/**
	 * 密码解密
	 * 
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public final static String decrypt(String PASSWORD_CRYPT_KEY,String data) {
		try {
			return new String(decrypt(hex2byte(data.getBytes()),
					PASSWORD_CRYPT_KEY.getBytes()));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	

	public static String byte2hex(byte[] b) {

		String hs = "";

		String stmp = "";

		for (int n = 0; n < b.length; n++) {

			stmp = (Integer.toHexString(b[n] & 0XFF));

			if (stmp.length() == 1)

				hs = hs + "0" + stmp;

			else

				hs = hs + stmp;

		}

		return hs.toUpperCase();

	}

	public static byte[] hex2byte(byte[] b) {

		if ((b.length % 2) != 0)

			throw new IllegalArgumentException("长度不是偶数");

		byte[] b2 = new byte[b.length / 2];

		for (int n = 0; n < b.length; n += 2) {

			String item = new String(b, n, 2);

			b2[n / 2] = (byte) Integer.parseInt(item, 16);

		}

		return b2;
	}
	
	//加密
	public static final String encrypt(String PASSWORD_CRYPT_KEY,String data) {
	   try {
		     String strc = data;
		     strc = new String(strc.getBytes("GB2312"));
	        return byte2hex(encrypt(data.getBytes(),PASSWORD_CRYPT_KEY.getBytes()));
		 } catch (Exception localException) {
			 localException.printStackTrace();
			 return null;
		   }
		     
     }
	
	 private static byte[] encrypt(byte[] src, byte[] key)throws Exception
	 {
		 SecureRandom sr = new SecureRandom();
	     DESKeySpec dks = new DESKeySpec(key); 
	     SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
	     SecretKey securekey = keyFactory.generateSecret(dks); 
	     Cipher cipher = Cipher.getInstance("DES");
	     cipher.init(1, securekey, sr);
	  
	     return cipher.doFinal(src);
	  }
	
	
}
